ViziQuer allows graphical construction of SPARQL queries over given data schema that can be loaded from the ontology file or obtained by exploring a SPARQL endpoint.
ViziQuer supports both simple and aggregate query formulation.

Download and unzip the archive to any folder on your computer.
Run the executable tda.exe.
First time you will be asked to register 2 components that are used by tool.
Choose 'Project->New project' for a new project, or 'Project->Open project' to open an existing project
(projects are by default stored in Projects subfolder of the main tool folder).

OWLGrEd - a tool for graphical OWL ontology visualization and authoring.OBIS - Ontology Based Information System. By creating an ontolgy you can get a web based information system for data manipulation!